package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增菜品对应口味
     *
     * @param dishDTO
     */
    @Transactional
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {
        //获取菜品信息
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品表中插入1条数据
        dishMapper.insert(dish);
        Long id = dish.getId();

        //向口味表插入n条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() != 0) {
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(id));
            dishFlavorMapper.insert(flavors);
        }
    }

    /**
     * 菜品分页查询
     *
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.dishQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 根据id删除菜品
     *
     * @param ids
     */
    @Override
    @Transactional
    public void deleteByIds(List<Long> ids) {
        //判断菜品是否启售--起售状态无法删除
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //判断菜品是否与套餐关联--包含在套餐中无法删除
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        /*//删除菜品
        for (Long id : ids) {
            //删除菜品表中数据
            dishMapper.deleteById(id);
            //删除与菜品关联的口味表中数据
            dishFlavorMapper.deleteByDishId(id);
        }*/

        //利用动态sql优化删除菜品表中数据
        dishMapper.deleteByIds(ids);
        //利用动态sql优化删除与菜品关联的口味表中数据
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品和口味
     *
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品
        Dish dish = dishMapper.getById(id);
        //根据菜品id查询口味
        List<DishFlavor> flavors = dishFlavorMapper.getByDishId(id);

        //将菜品和口味封装并返回
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(flavors);
        return dishVO;
    }

    /**
     * 根据id修改菜品和对应的口味
     *
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //修改菜品表数据
        dishMapper.update(dish);
        //删除口味表中数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //向口味表插入n条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() != 0) {
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishDTO.getId()));
            dishFlavorMapper.insert(flavors);
        }
    }

    /**
     * 菜品起售，停售状态修改
     *
     * @param status
     * @param id
     */
    @Override
    @Transactional
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder().status(status)
                .id(id)
                .build();
        //在菜品表中更新状态
        //dishMapper.updateStatusById(status,id);//旧方法需要新增方法，复用性较差
        dishMapper.update(dish);

        //若停售，则在也停售相应套餐表
        if (StatusConstant.DISABLE == status) {
            //获取套餐id
            ArrayList<Long> ids = new ArrayList<>();
            ids.add(id);
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);

            if (setmealIds != null && setmealIds.size() > 0) {
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }

    /**
     * 根据分类id查询菜品
     *
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> getByCategoryId(Long categoryId) {
        List<Dish> list = dishMapper.getByCategoryId(categoryId);
        return list;
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
